<template>
  <el-breadcrumb class="app-breadcrumb" separator="/">
    <div style="position: fixed;right: 100px">
      <span style="color: red">{{ time }}</span>
      <el-divider direction="vertical"/>
      <el-dropdown trigger="click" >
        <span class="el-dropdown-link">
          <i class="el-icon-bell"/>
          <el-badge is-dot class="item" />
        </span>
        <el-dropdown-menu slot="dropdown">
          <el-dropdown-item class="clearfix">
            评论
            <el-badge :value="12" class="mark" />
          </el-dropdown-item>
          <el-dropdown-item class="clearfix">
            回复
            <el-badge :value="3" class="mark" />
          </el-dropdown-item>
        </el-dropdown-menu>
      </el-dropdown>
      <el-divider direction="vertical"/>
    </div>
    <transition-group name="breadcrumb">
      <el-breadcrumb-item v-for="(item,index) in levelList" v-if="item.meta.title" :key="item.path">
        <span v-if="item.redirect==='noredirect'||index==levelList.length-1" class="no-redirect">{{ item.meta.title }}</span>
        <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
      </el-breadcrumb-item>
    </transition-group>
  </el-breadcrumb>
</template>

<script>
import pathToRegexp from 'path-to-regexp'
export default {
  data() {
    return {
      levelList: null,
      time: ''
    }
  },
  watch: {
    $route() {
      this.getBreadcrumb()
    }
  },
  created() {
    this.getBreadcrumb()
    this.getTime()
  },
  methods: {
    getTime() {
      setInterval(() => {
        this.time = new Date().toLocaleString()
      }, 1000)
    },
    getBreadcrumb() {
      let matched = this.$route.matched.filter(item => {
        if (item.name) {
          return true
        }
      })
      const first = matched[0]
      if (first && first.name !== 'home') {
        matched = [{ path: '/home', meta: { title: '主页' }}].concat(matched)
      }
      this.levelList = matched
    },
    pathCompile(path) {
      // To solve this problem https://github.com/PanJiaChen/vue-element-admin/issues/561
      const { params } = this.$route
      var toPath = pathToRegexp.compile(path)
      return toPath(params)
    },
    handleLink(item) {
      const { redirect, path } = item
      if (redirect) {
        this.$router.push(redirect)
        return
      }
      this.$router.push(this.pathCompile(path))
    }
  }
}
</script>

<style rel="stylesheet/scss" lang="scss" scoped>
  .app-breadcrumb.el-breadcrumb {
    display: inline-block;
    font-size: 14px;
    line-height: 50px;
    margin-left: 10px;
    .no-redirect {
      color: #97a8be;
      cursor: text;
    }
  }

</style>
